土壤水分境況對水稻生育之影響II、水稻生理性狀與光合作用

本試驗目的在探討減少灌溉水對水稻生理作用之影響。試驗分為田間試驗及盆栽試驗兩部分，1992年一、二期作在中興大學農場及溫室進行。採裂區設計，以品種為副區，比較稉稻台中189號及秈稻台中秈10號兩品種對土壤水分張力處理之反應。以15公分深度土壤水分張力處理為主區，分別以0.00 Mpa（連續浸水），0.02 MPa及0.04 MPa等三級土壤水分張力，做為灌溉起點。連續兩個期作試驗結果顯示，在高土壤水分張力處理下，水稻葉片水分潛勢均明顯降低，臺中189號在高土壤水分張力處理下，其葉片水分潛勢均較臺中秈10號為低。提高土壤水分張力，水稻葉片氣孔導度有下降的趨勢，特別是0.04 MPa之處理，其降低的幅度更大，臺中189號所測得的氣孔導度，均較臺中秈10號低。高土壤水分張力處理亦抑制光合作用速率，一期作臺中189號在高土壤水分張力之處理，其光合作用速率較浸水處理顯著降低19%，臺中秈10號亦降低15%（0.02 MPa）及22%（0.04 MPa）。品種間則臺中秈10號之光合作用速率比臺中189號高出約10%。

關鍵字

水稻；土壤水分境況；水分潛勢；氣孔導度；光合作用

並列摘要

Field and pot experiments were conducted in the first and second crops of 1992 to investigate the effects of controlled soil moisture regime on the physiological performances and photosynthesis of two rice cultivars, Taichung 189 and Taichung sen 10. Split-plot design was laid out with three replications. Two rice cultivars were used as subplot, and three levels of soil moisture tension as main plot. During vegetative growth stage, soil-drying were practiced to reach 0.02, and 0.04 MPa before next irrigation, while the control (0.00 MPa) group was submerged continuously. Three levels (0.3, 0.6, and 1.2 g/pot) of nitrogen fertilizer, which are equivalent to 60, 120 and 240 kg N/ha, respectively, were applied to pot experiment for comparison of effects of nitrogen among different soil moisture treatment regimes. Experimental results showed that a lower leaf water potential and stomata conductivity in rice leaves of 0.02 and 0.04 MPa treatments than that of the control. Photosynthetic rates of Taichyng 189 decreased by 19-23% of 0.02 and 0.04 MPa treatments than that of the control, while that of Taichung sen 10 decreased by 15-22%. The average photosynthetic rate of Taichuhg sen 10 was 10% higher than that of Taichung 189.

並列關鍵字

rice ； soil moisture regime ； water potential ； stomata conductivity ； photosynthetic rate

被引用紀錄

唐順元（2007）。高溫下番茄屬植物淹水之生理反應〔碩士論文，國立臺灣大學〕。華藝線上圖書館。https://doi.org/10.6342/NTU.2007.10498

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土壤水分境況對水稻生育之影響II、水稻生理性狀與光合作用

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